def drop_duplicates_in_place(lst):
    # Write the rest of the code for question 3b below here.
  i = 0
  while  i < len(lst) - 1:
    if lst[i + 1: len(lst) - 1].count(lst[i]) > 0 :
      k = len(lst)
      for x in range (i + 1 , k):
          if lst[x] == lst[i] :
              del lst[x]
              k = k - 1
    i = i + 1

lst = [1,2,3,4,5,6,7,8,8,2,666,9]
drop_duplicates_in_place(lst)
print(lst)